Does it accept base64url (the JWT alphabet)?

Yes — the - and _ alphabet is accepted, and missing padding is added automatically. That's what real JWTs and SAP payloads look like.

What if the input isn't valid Base64?

It says which problem it is — an unexpected character, or the wrong length/padding — rather than returning garbage that looks like a result.

encoders · Integration Studio Tool

Base64 Decode

Decode Base64 back to text, UTF-8 safe.

Your data never leaves your browser

This tool runs entirely on your computer. What you paste or drop is never uploaded, never stored and never seen by us — close the tab and it's gone. How we know

Input

Output

Press Run to see the output. Sign up takes ten seconds — no credit card required.

Worked example

Input

aGVsbG8=

Output

hello

This example is one of Base64 Decode's test cases — if the tool stopped producing this output, the build would fail.

Questions

Does it accept base64url (the JWT alphabet)?: Yes — the - and _ alphabet is accepted, and missing padding is added automatically. That's what real JWTs and SAP payloads look like.
What if the input isn't valid Base64?: It says which problem it is — an unexpected character, or the wrong length/padding — rather than returning garbage that looks like a result.

Related tools

Base64 EncodeEncoders

Encode text to Base64 — payloads, certificates, attachments.

URL EncodeEncoders

Percent-encode text for URLs and query strings.

URL DecodeEncoders

Decode percent-encoded URL text back to readable form.

JWT DecoderEncoders

Read a JWT's header and claims — it never leaves your browser, and we never verify the signature.